Six roller (6-hi) cold rolling mill introduction 6-Hi rolling mill is especially suitable for high precision rolling at high rolling speed, can give a variety of finished thicknesses, reducing steel coil strip from 3mm to 0.10mm with width ranging from 500 to 1250mm.Different materials and...
Six roller (6-hi) cold rolling mill introduction
6-Hi rolling mill is especially suitable for high precision rolling at high rolling speed, can give a variety of finished thicknesses, reducing steel coil strip from 3mm to 0.10mm with width ranging from 500 to 1250mm.Different materials and different states of metal plates require different rolling processes, the cold rolled plate precision level decides the rolling mill configuration, the yearly or monthly production decides the rolling capacity and rolling speed.We design each cold rolling mill based on precise calculation of rolling process required by each client. Customers trust us because we make the rolling mill exactly as what they want.
The main composition of a reversible six high rolling mill line
Uncoiler, coil-head opener, pinch rollers and seven roller leveler, left recoiler, entrance processing table, 6-hi cold rolling mill, exit processing table, right recoiler.
Composition of a 6-hi cold rolling mill
Rollers: one pair of work rollers(upper work roller and lower work roller) , one pair of middle rollers( one upper middle roller and one lower middle roller), and one pair of backup rollers(one upper backup roller and one lower backup roller)
Rolling stand: Two stands pair well and are connected oppositely, To process the pair of stands wholly, manually shovel the surface to be flat, with sliding plate at window.
Press-down equipment: hydraulic AGC.
Drive mechanism: motor, speed reducing gearbox and distribution gearbox.
Control: DC speed driver, encoder, PLC, tension control
Typical 6-Hi rolling mill models
1) Ø145×600/Ø195×600/Ø550×570 reversible 6-hi cold rolling mill.
Application:≤500mm width, output ≥0.1mm thickness, for pickled plain carbon steel coil strip(tensile strength 350-500Mpa).
Work process and Production:
uncoiling → uncoiling → pinch feeding & straightening
↓
Left recoiling←→6-hi reversible rolling mill←→Right recoiling → Coil discharging car
Input Steel coils:
Steel material: plain carbon steel, pickled, etc.
Tensile strength 350～500 Mpa, yield strength 195-240Mpa
0.8～2.0 mm thickness
300～500mm width
Max outer diameter: 1700 mm
Inner diameter: 508mm
Max coil weight: 8t
Output: 0.1～0.5× 300～500mm
Inner diameter of recoiled coil: 508mm
Machine Parameters:
Max rolling force: 4500 KN
Rolling torque: 25KN.m
Rolling speed: max 500 m/min
Recoiling speed: max 530 m/min
Recoiling force: 45 KN
Height of rolling mill workline: 1000 mm
Total installation power: about 1900 KW
2)φ185×850mm/φ320×850mm/φ760×820mm 6-Hi Reversible Cold Rolling Mill 600m/min
Input Raw Material:
Hot rolled steel coil after being cleaned by pickling, either edge trimmed or not
Low carbon or medium carbon steel, low alloy steel
Steel grade: Q195-Q235; 08Al; SPHC; SPHD; SPHE
Tensile strength: max 450N/mm²
Yield strength: 140-360N/mm²
Coil Thickness: 1.5-3.0mm.
Coil width: 500～750mm
Coil ID: φ508mm
Coil OD: φ800～φ2000mm
Max coil weight: 18t
Finished Coil -Cold Rolled Coil:
Finished thickness: 0.2～0.8mm
Finished width: 500～750mm
Max thickness reducing degree: total thickness reduction of different hardness material is different. Q195≤91% Q235≤90% Q345≤85%
Rolling precision:
（“δ” as the finished thickness）
Thickness tolerance in longitude： | |
Stable rolling | ≤±2%δ |
Acceleration or Deceleration rolling | ≤±3%δ |
Max rolling pressure: 7000 KN
Max rolling torque: 90 KN.m
Max rolling speed:600m/min
Max uncoiling speed: 200 m/min
Max recoiling speed: 660m/min
Uncoiling tension: max 40kn
Recoiling tension:10-70KN
Uncoiling mandrel diameter(expand, compact): φ520/φ470mm
Recoiling mandrel diameter(expand, compact) : φ508/φ485mm
Rolling stand section: 450×550mm2
Minimum opening of work rollers: 20mm
Positive/negative roller bending force(each side of each work roller) : +150kn/-80kn
Positive roller bending force(one side of each middle roller) : 300kn
Transverse transfer of middle roller: +120mm for upper middle roller, -120mm for lower middle roller
Systematic pressure of general low-voltage hydraulic system: 0mpa
Systematic pressure of roller bending hydraulic system: 18.5mpa
Systematic pressure of Hydraulic AGC system: 23mpa
Total installation power: 2800KW
Height of rolling line: 1000mm
2) φ280×1380mm/φ380×1350mm/φ1050×1350mm Six Roller Reversible Cold Rolling Mill 720m/min
Input Raw Material:
Hot rolled steel coil after being cleaned by pickling, either edge trimmed or not
Low carbon or medium carbon steel, low alloy steel
Steel grade: Q195-Q235; 08Al; SPHC; SPHD; SPHE
Tensile strength: max 450N/mm²
Yield strength: 140-360N/mm²
Coil Thickness: 2.5-4.0mm.
Coil width: 1000～1250mm
Coil ID:φ610mm
Coil OD:φ800～φ2000mm
Max coil weight: 25t
Finished Coil -Cold Rolled Coil:
Finished thickness: 0.2～0.3mm
Finished width: 1000～1250mm
Machine Parameters
Max rolling pressure: 14000 KN
Max rolling torque: 120 KN.m
Max rolling speed: 720m/min
Recoiling tension: 170KN
Recoiling mandrel diameter(expand, compact):φ610/φ585mm
Rolling stand section: 540×640mm2
Minimum opening of work rollers: 20mm
Positive/negative roller bending force(each side of each work roller): +300kN/-180kN
Positive roller bending force(one side of each middle roller): 500kN
Transverse transfer of middle roller: +150mm for upper middle roller, -150mm for lower middle roller
Total installation power: 10000KW
Configuration
Hydraulic AGC press-up system with automatic control, including hydraulic press-up cylinders, AGC control system, hydraulic station, thickness gauges, with functions of constant roller clearance position control, constant pressure control and automatic tilt adjusting control.
CPU computer automatic control system
HIM touch screen for dynamic display, rolling parameters setting, breakdown alarms and report printing
Digital DC drive
Drive middle rollers (separately drive upper middle roller and lower middle roller
Rollers cooling control divided in five zones , emusified water flow control
Work roller positive/negative bending control
Presetting of middle roller transfer and middle roller positive bending control
Zero setting of rolling centerline by wedge
Work rollers and middle rollers fast changing equipment
Automatic adjustment of rolling speed and tension
Protection measures in case of strip break, accidents alarms and emergency stop
Oil gas lubrication for work rollers, middle rollers and backup rollers
Roller bearings for backup rollers
X-ray thickness gauge
Rolling process linkage and defect alarms controlled by PLC
The presetting of rolling process, the inspection, display and alarm of rolling process parameters and critical machine parameters
FAQ
1.Are you a manufacturer, trading company or a third party?
A: We are a manufacturer established in 2000.
2.As the shipping period will take long time, how can you make sure the machine won’t be broken?
A: Our machine is film wrapped, to make sure the machine can be delivered to our customer in safe conditions, we fix the machine in the container by steel wires / ropes.
